JP2599324B2 - Valve train for 4-stroke engine - Google Patents
Valve train for 4-stroke engineInfo
- Publication number
- JP2599324B2 JP2599324B2 JP3303893A JP30389391A JP2599324B2 JP 2599324 B2 JP2599324 B2 JP 2599324B2 JP 3303893 A JP3303893 A JP 3303893A JP 30389391 A JP30389391 A JP 30389391A JP 2599324 B2 JP2599324 B2 JP 2599324B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- intake
- valves
- sides
- respect
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は４行程エンジンの動弁装
置に関するものであり、特に燃焼室に弁ばねによって閉
じられる複数個の吸気弁を設け、共通のカム軸により開
閉するように構成した動弁装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve train for a four-stroke engine, and more particularly, to a combustion chamber provided with a plurality of intake valves which are closed by a valve spring and opened and closed by a common camshaft. The present invention relates to a valve train.
【０００２】[0002]
【従来の技術】従来、自動二輪車や乗用車のエンジンで
は、高性能を得るために１個の気筒あたり２個あるいは
３個の吸気弁を設け、弁リフタを介して動弁カムにより
直接に開閉することが行われている（例えば、特開昭５
７−１７６３１１号公報参照）。2. Description of the Related Art Conventionally, in engines of motorcycles and passenger cars, two or three intake valves are provided for each cylinder in order to obtain high performance, and are directly opened and closed by a valve cam via a valve lifter. (For example, Japanese Unexamined Patent Application Publication No.
No. 7-176311).
【０００３】また、従来のこの種の動弁装置では、弁リ
フタの偏摩耗を防ぐために弁リフタを回転させていた。
弁リフタを回転させるには、通常はカム軸のカム体の中
心と弁リフタの中心とを偏位させ、カム軸の回転によっ
て弁リフタを摩擦駆動する手法が採られていた。なお、
各カム体は、カム軸の軸線方向に沿う同一方向へ偏位さ
れていた。Further, in this type of conventional valve train, the valve lifter is rotated in order to prevent uneven wear of the valve lifter.
In order to rotate the valve lifter, usually, a method has been adopted in which the center of the cam body of the camshaft and the center of the valve lifter are deviated, and the valve lifter is frictionally driven by the rotation of the camshaft. In addition,
Each cam body was displaced in the same direction along the axial direction of the cam shaft.
【０００４】[0004]
【発明が解決しようとする課題】しかるに、複数の吸気
弁を１本の吸気カム軸によって駆動する構造では、隣接
する弁リフタが干渉することとなって設計が難しくなる
という問題があった。However, in a structure in which a plurality of intake valves are driven by a single intake camshaft, there is a problem in that adjacent valve lifters interfere with each other, making the design difficult.
【０００５】すなわち、隣接する弁リフタどうしが干渉
するのを避けるようにすると、弁リフタの径を小さくし
なければならず、かといって弁リフタの間隔を拡げるよ
うにすると、吸気弁を燃焼室の中央付近に設置できなく
なってしまう。In other words, in order to avoid interference between adjacent valve lifters, the diameter of the valve lifter must be reduced. On the other hand, if the interval between the valve lifters is increased, the intake valve will be connected to the combustion chamber. Can not be installed near the center of the building.
【０００６】また、同期して開閉する複数の吸気弁に対
応する弁リフタに対して、全カム体がカム軸の同一軸方
向に偏位している関係から、弁リフタへの回転トルクの
付与に伴ってカム体に反力が作用し、エンジン運転時に
カム軸を同一方向に移動させるスラスト力が生じてい
た。このため、従来の動弁装置においては大きなスラス
ト打音が発生していた。Further, since all cams are deviated in the same axial direction of the camshaft with respect to the valve lifters corresponding to a plurality of intake valves which open and close in synchronization, rotation torque is applied to the valve lifters. As a result, a reaction force acts on the cam body, and a thrust force for moving the camshaft in the same direction when the engine is operating is generated. For this reason, in the conventional valve train, a large thrust hitting sound has been generated.
【０００７】[0007]
【課題を解決するための手段】本発明に係る４行程エン
ジンの動弁装置は、１気筒当たり３個の吸気弁と複数の
排気弁を備え、これらの弁を燃焼室の中心を通りカム軸
に平行な中心線の一側と他側に振り分け、中間の吸気弁
を、両側の吸気弁よりも前記中心線に対してシリンダ外
側に位置させる一方、中間の吸気弁のシリンダ軸線に対
する傾きを両側の吸気弁のそれよりも小さく、かつカム
軸方向に見て中間の吸気弁と両側の吸気弁の延長線を燃
焼室の上方で交差させ、各吸気弁の上端を弁リフタの底
面に対向させるとともに、共通の吸気カム軸の外周に、
吸気弁用の弁リフタの冠面に接触する３つのカム体を形
成した４行程エンジンにおいて、両側の吸気弁用の弁リ
フタの軸心を、それぞれに対応するカム体の中心線に対
して中間の吸気弁用弁リフタから離れる方向に偏位させ
たものである。According to the present invention, a valve train for a four-stroke engine according to the present invention includes three intake valves and a plurality of exhaust valves per cylinder, and these valves pass through the center of a combustion chamber and pass through a camshaft. And the middle intake valve is positioned outside the cylinder with respect to the center line than the intake valves on both sides, while the inclination of the middle intake valve with respect to the cylinder axis is changed on both sides. The extension lines of the intermediate intake valve and the intake valves on both sides are smaller than that of the intake valves in the camshaft direction, and the upper lines of the intake valves are opposed to the bottom surface of the valve lifter. At the same time, on the outer periphery of the common intake camshaft,
In a four-stroke engine in which three cam bodies are formed in contact with a crown surface of a valve lifter for an intake valve, the axial centers of the valve lifters for the intake valves on both sides are set at intermediate positions with respect to the center lines of the corresponding cam bodies. Is deviated in a direction away from the intake valve lifter.
【０００８】[0008]
【作用】吸気弁の設置位置を変えることなく弁リフタど
うしの間隔が拡がり、弁リフタが相互に干渉し合うこと
がなくなる。The spacing between the valve lifters is increased without changing the installation position of the intake valve, and the valve lifters do not interfere with each other.
【０００９】また、両側の弁リフタはカム体に対する偏
位方向が互いに逆方向となるから、吸気カム軸によって
摩擦駆動されるときには互いに逆方向へ回転することに
なる。このため、両側の弁リフタから吸気カム軸にそれ
ぞれ加えられるスラスト力は、互いに逆方向となって相
殺される。Further, since the valve lifters on both sides are displaced in directions opposite to each other with respect to the cam body, they rotate in directions opposite to each other when frictionally driven by the intake camshaft. For this reason, the thrust forces applied from the valve lifters on both sides to the intake camshaft are canceled in opposite directions.
【００１０】[0010]
【実施例】以下、本発明の一実施例を図１ないし図４に
よって詳細に説明する。図１は本発明に係る４行程エン
ジンの動弁装置を示す断面図、図２は本発明に係る動弁
装置を装着した４行程エンジンの燃焼室の底面図、図３
は本発明に係る４行程エンジンの動弁装置を示す平面
図、図４は図１におけるIV−IV線断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a sectional view showing a valve train of a four-stroke engine according to the present invention. FIG. 2 is a bottom view of a combustion chamber of a four-stroke engine equipped with the valve train of the present invention.
FIG. 1 is a plan view showing a valve train of a four-stroke engine according to the present invention, and FIG. 4 is a sectional view taken along line IV-IV in FIG.
【００１１】これらの図において、１は４行程エンジン
であり、気筒毎に３個の吸気弁２と、それを介して燃焼
室３に連なる吸気通路２１とを有している。４は気筒毎
に２個設けられた排気弁であり、燃焼室３に連なる排気
通路４１を開閉する。In these figures, reference numeral 1 denotes a four-stroke engine, which has three intake valves 2 for each cylinder and an intake passage 21 connected to the combustion chamber 3 via the intake valves 2. Reference numeral 4 denotes two exhaust valves provided for each cylinder, which open and close an exhaust passage 41 connected to the combustion chamber 3.
【００１２】５は燃焼室３を形成するシリンダヘッド、
３ａは点火栓の電極で、この電極３ａは燃焼室３の略中
央に臨んでいる。5 is a cylinder head forming the combustion chamber 3;
Reference numeral 3a denotes an electrode of a spark plug, and this electrode 3a faces substantially the center of the combustion chamber 3.
【００１３】前記吸気弁２および排気弁４は、図２に示
すように、燃焼室３の中心を通り後述するカム軸に平行
な中心線の一側と他側とに振り分けられている。そし
て、各吸気弁２は弁ガイド６へ摺動自在に嵌挿され、弁
ばね７、リテーナ８によってシリンダヘッド５の弁座へ
取付けられている。As shown in FIG. 2, the intake valve 2 and the exhaust valve 4 are distributed to one side and the other side of a center line passing through the center of the combustion chamber 3 and parallel to a cam shaft described later. Each intake valve 2 is slidably fitted into a valve guide 6 and attached to a valve seat of a cylinder head 5 by a valve spring 7 and a retainer 8.
【００１４】３個の吸気弁２のうち中間の吸気弁２の配
設位置は、両側の吸気弁２よりも前記中心線に対してシ
リンダ外側（シリンダの内周壁寄り）であって、点火栓
の外側（点火栓の電極３ａの丁度真横）となる位置に設
定されている。さらに、両側の吸気弁２は、点火栓の電
極３ａよりカム軸の軸方向両側となる位置に位置づけら
れている。The arrangement position of the intermediate intake valve 2 among the three intake valves 2 is located outside the cylinder with respect to the center line (closer to the inner peripheral wall of the cylinder) than the intake valves 2 on both sides, and (Just right next to the electrode 3a of the spark plug). Further, the intake valves 2 on both sides are positioned at positions on both sides in the axial direction of the cam shaft with respect to the electrode 3a of the ignition plug.
【００１５】そして、中間の吸気弁２は、シリンダ軸線
に対する傾斜角度が両側の吸気弁２のそれよりも小さく
なるように傾斜して装着されており、中間の吸気弁２の
弁杆２ａの延長線と、両側の吸気弁２の弁杆２ａの延長
線とは、カム軸方向に見て燃焼室３の上方で交差してい
る。The intermediate intake valve 2 is mounted so as to be inclined such that the inclination angle with respect to the cylinder axis is smaller than that of the intake valves 2 on both sides, and an extension of the valve rod 2a of the intermediate intake valve 2 is provided. The line and the extension of the valve rod 2a of the intake valve 2 on both sides intersect above the combustion chamber 3 when viewed in the cam axis direction.
【００１６】８ａは二つ割り形の弁コッタであり、よく
知られているように、内面は弁杆２ａに設けた外周溝に
係合し、外面はリテーナ８の円錐孔に係止されている。
９は倒立カップ形に形成された鋼製の弁リフタであり、
シリンダヘッド５の案内面５ａに摺動自在に嵌合される
筒部９ａと、その冠面をなしかつ吸気カム軸１１と吸気
弁２の弁杆２ａとの間に介装される頂部９ｂとから構成
されている。Reference numeral 8a denotes a split type valve cotter. As is well known, an inner surface is engaged with an outer peripheral groove provided in the valve rod 2a, and an outer surface is engaged with a conical hole of the retainer 8.
9 is a steel valve lifter formed in an inverted cup shape,
A cylindrical portion 9a slidably fitted on the guide surface 5a of the cylinder head 5, a top portion 9b forming a crown surface and interposed between the intake camshaft 11 and the valve rod 2a of the intake valve 2; It is composed of
【００１７】また、吸気カム軸１１のカム体１１ａは、
図４に示すように、そのカム面の幅方向中央（カム面中
心）が吸気弁２の軸心上に位置づけられるように形成位
置が設定されている。The cam body 11a of the intake camshaft 11 is
As shown in FIG. 4, the formation position is set such that the center of the cam surface in the width direction (center of the cam surface) is positioned on the axis of the intake valve 2.
【００１８】１２は熱処理によって硬化された鋼製のパ
ッドであり、前記頂部９ｂの裏面と弁杆２ａとの間に介
装され、弁杆２ａの頂部外面によって位置決めされてお
り、これを交換して弁隙間の大小を調節する。Reference numeral 12 denotes a steel pad hardened by heat treatment, which is interposed between the back surface of the top portion 9b and the valve rod 2a and is positioned by the outer surface of the top portion of the valve rod 2a. Adjust the size of the valve gap.
【００１９】本発明においては図４に示すように、中間
の弁リフタ９は中間の吸気弁２と同軸上に配置され、そ
の外側に配設された２個の弁リフタ９Ｌ、９Ｒはそれぞ
れ対応する吸気弁２の軸心より寸法ｅだけ外側へ偏位し
て設けられている。In the present invention, as shown in FIG. 4, the intermediate valve lifter 9 is disposed coaxially with the intermediate intake valve 2, and the two valve lifters 9L and 9R disposed outside thereof correspond to the intermediate intake valve 2 respectively. And is deviated outward from the axis of the intake valve 2 by a dimension e.
【００２０】さらに、両側の弁リフタ９Ｌ、９Ｒの軸線
は、図３に示すように、それぞれに対応する吸気カム軸
１１のカム体１１ａの中心線に対して、寸法ｅだけ中間
の吸気弁用弁リフタ９から離れる方向に偏位して位置づ
けられている。Further, as shown in FIG. 3, the axis of each of the valve lifters 9L and 9R on both sides is for the intake valve intermediate by the dimension e with respect to the center line of the cam body 11a of the corresponding intake cam shaft 11. It is positioned offset from the valve lifter 9.
【００２１】すなわち、本実施例では、３個の吸気弁２
およびそれに対応する３個のカム体１１ａはそれぞれ同
軸上に位置づけられ、両側の弁リフタ９Ｌ、９Ｒが寸法
ｅだけ吸気カム軸１１の軸端側へ（中間の弁リフタ９か
ら離れる方向へ）偏位されている。That is, in this embodiment, three intake valves 2
And the three cam bodies 11a corresponding thereto are coaxially positioned, and the valve lifters 9L and 9R on both sides are biased toward the shaft end of the intake camshaft 11 by a dimension e (in a direction away from the intermediate valve lifter 9). Has been ranked.
【００２２】なお、上述したように構成すると、弁リフ
タ９Ｌ、９Ｒの内面に弁ばね７の外周が接触する可能性
を生じるので、弁杆２ａを、弁ばね７との係合部（リテ
ーナ８装着部分）より弁リフタ９の頂部９ｂ側を延長し
て弁リフタ９の底部に対向させている。With the above-described configuration, there is a possibility that the outer periphery of the valve spring 7 comes into contact with the inner surfaces of the valve lifters 9L and 9R, so that the valve rod 2a is connected to the engaging portion (retainer 8) with the valve spring 7. The top 9b side of the valve lifter 9 is extended from the mounting portion) to face the bottom of the valve lifter 9.
【００２３】このため、弁杆２ａの弁ばね７より上の部
分のみが各弁リフタ９の内面孔へ入り、弁ばね７やリテ
ーナ８が入らないように構成して弁ばね７が弁リフタ９
に接触するのを防止することができる。For this reason, only the portion of the valve rod 2a above the valve spring 7 enters the inner surface hole of each valve lifter 9 so that the valve spring 7 and the retainer 8 do not enter.
Can be prevented.
【００２４】上述したように構成された４行程エンジン
の動弁装置では、吸気カム軸１１が回転してカム体１１
ａにより弁リフタ９が押されると、それに伴って吸気弁
２が開動作される。In the valve train of a four-stroke engine constructed as described above, the intake camshaft 11 rotates and the cam body 11
When the valve lifter 9 is pushed by a, the intake valve 2 is opened accordingly.
【００２５】このときには、両側の弁リフタ９Ｌ、９Ｒ
は、その軸心がカム体１１ａの中心に対して偏位してい
る関係から、回転するカム体１１ａによって摩擦駆動さ
れることになる。回転方向としては、弁リフタ９Ｌ、９
Ｒの偏位方向が互いに逆であるために逆方向となる。At this time, the valve lifters 9L, 9R on both sides
Is driven frictionally by the rotating cam body 11a because its axis is deviated from the center of the cam body 11a. As the rotation direction, the valve lifters 9L and 9L
Since the deflection directions of R are opposite to each other, the directions are opposite.
【００２６】例えば、吸気カム軸１１が図１において左
回りに回転したとすると、弁リフタ９Ｌは図３において
右回りに回転し、弁リフタ９Ｒは左回りに回転する。For example, if the intake camshaft 11 rotates counterclockwise in FIG. 1, the valve lifter 9L rotates clockwise in FIG. 3, and the valve lifter 9R rotates counterclockwise.
【００２７】したがって、本発明によれば、吸気弁２の
設置位置を変えることなく弁リフタ９どうしの間隔を拡
げることができるから、弁リフタ９が相互に干渉し合う
ことがなくなる。Therefore, according to the present invention, the interval between the valve lifters 9 can be increased without changing the installation position of the intake valve 2, so that the valve lifters 9 do not interfere with each other.
【００２８】また、両側の弁リフタ９はカム体１１ａに
対する偏位方向が互いに逆方向となるから、吸気カム軸
１１によって摩擦駆動されるときには互いに逆方向へ回
転することになる。このため、両側の弁リフタ９Ｌ、９
Ｒから吸気カム軸１１にそれぞれ加えられるスラスト力
は、互いに逆方向となって相殺される。Further, since the valve lifters 9 on both sides are displaced in directions opposite to each other with respect to the cam body 11a, they rotate in opposite directions when driven by the intake camshaft 11 by friction. For this reason, the valve lifters 9L, 9 on both sides
The thrust forces applied to the intake camshaft 11 from R are canceled in opposite directions.
【００２９】さらに、本実施例で示したように、吸気弁
２の弁杆２ａを弁ばね７の係合部より端部側へ延長して
弁リフタ９の底部に対向させると、弁ばね７が弁リフタ
９の裏面内へ入らず、弁杆２ａに対して弁リフタ９が偏
位していても、弁ばね７の直径が制限されることがな
い。Further, as shown in this embodiment, when the valve rod 2a of the intake valve 2 is extended toward the end from the engagement portion of the valve spring 7 and is opposed to the bottom of the valve lifter 9, the valve spring 7 Does not enter the back surface of the valve lifter 9 and the valve lifter 9 is displaced with respect to the valve rod 2a, the diameter of the valve spring 7 is not limited.
【００３０】なお、本実施例では、弁リフタ９として弁
杆２ａのとの間にパッド１２が介装された倒立カップ形
のものを使用した例を示したが、図５に示すように、ラ
ッシュアジャスタ形のものを使用することもできる。In the present embodiment, an example is shown in which an inverted cup type in which a pad 12 is interposed between the valve rod 2a and the valve lifter 9 is used, but as shown in FIG. A lash adjuster type can also be used.
【００３１】図５は弁リフタの変形例を示す断面図で、
同図において前記図１ないし図４で説明したものと同一
もしくは同等部材については、同一符号を付し詳細な説
明は省略する。図６中符号９で示す弁リフタはラッシュ
アジャスタ形のものである。FIG. 5 is a sectional view showing a modification of the valve lifter.
In this figure, the same or equivalent members as those described with reference to FIGS. The valve lifter indicated by reference numeral 9 in FIG. 6 is a lash adjuster type.
【００３２】[0032]
【発明の効果】以上説明したように本発明に係る４行程
エンジンの動弁装置は、１気筒当たり３個の吸気弁と複
数の排気弁を備え、これらの弁を燃焼室の中心を通りカ
ム軸に平行な中心線の一側と他側に振り分け、中間の吸
気弁を、両側の吸気弁よりも前記中心線に対してシリン
ダ外側に位置させる一方、中間の吸気弁のシリンダ軸線
に対する傾きを両側の吸気弁のそれよりも小さく、かつ
カム軸方向に見て中間の吸気弁と両側の吸気弁の延長線
を燃焼室の上方で交差させ、各吸気弁の上端を弁リフタ
の底面に対向させるとともに、共通の吸気カム軸の外周
に、吸気弁用の弁リフタの冠面に接触する３つのカム体
を形成した４行程エンジンにおいて、両側の吸気弁用の
弁リフタの軸心を、それぞれに対応するカム体の中心線
に対して中間の吸気弁用弁リフタから離れる方向に偏位
させたため、吸気弁の設置位置を変えることなく弁リフ
タどうしの間隔が拡がり、弁リフタが相互に干渉し合う
ことがなくなる。As described above, the valve train of a four-stroke engine according to the present invention has three intake valves and a plurality of exhaust valves per cylinder, and these valves are passed through the center of the combustion chamber to form a cam. Distribute the center line parallel to the axis to one side and the other side, and position the middle intake valve outside the cylinder with respect to the center line than the intake valves on both sides, while tilting the middle intake valve with respect to the cylinder axis. When viewed in the camshaft direction, the extension lines of the middle intake valve and the intake valves on both sides cross each other above the combustion chamber, and the upper end of each intake valve faces the bottom surface of the valve lifter. In addition, in a four-stroke engine in which three cam bodies are formed on the outer periphery of a common intake camshaft to come into contact with the crown surface of a valve lifter for an intake valve, the axial centers of the valve lifters for the intake valves on both sides are respectively With respect to the center line of the cam body corresponding to Because of being displaced in a direction away from the valve valve lifters, spread is interval between the valve lifter without changing the installation position of the intake valve, the valve lifter that is no longer interfere with each other.
【００３３】したがって、吸気弁を燃焼室の中央付近に
位置づけつつ比較的大径の弁リフタを使用できるように
なる。Accordingly, a relatively large-diameter valve lifter can be used while the intake valve is positioned near the center of the combustion chamber.
【００３４】また、両側の弁リフタはカム体に対する偏
位方向が互いに逆方向となるから、吸気カム軸によって
摩擦駆動されるときには互いに逆方向へ回転することに
なる。このため、両側の弁リフタから吸気カム軸にそれ
ぞれ加えられるスラスト力は互いに逆方向となって相殺
される。Further, the valve lifters on both sides are displaced in directions opposite to each other with respect to the cam body, and therefore rotate in opposite directions when driven frictionally by the intake camshaft. For this reason, the thrust forces applied to the intake camshaft from the valve lifters on both sides are respectively offset in opposite directions.
【００３５】したがって、吸気カム軸が摩擦駆動時の反
力によって軸方向へ移動するのを防いでスラスト打音を
抑えることができる。Accordingly, it is possible to prevent the intake camshaft from moving in the axial direction due to the reaction force at the time of the friction drive, thereby suppressing the thrust hitting sound.
【図１】本発明に係る４行程エンジンの動弁装置を示す
断面図である。FIG. 1 is a sectional view showing a valve train of a four-stroke engine according to the present invention.
【図２】本発明に係る動弁装置を装着した４行程エンジ
ンの燃焼室の底面図である。FIG. 2 is a bottom view of a combustion chamber of a four-stroke engine equipped with the valve train according to the present invention.
【図３】本発明に係る４行程エンジンの動弁装置を示す
平面図である。FIG. 3 is a plan view showing the valve gear of the four-stroke engine according to the present invention.
【図４】図１におけるIV−IV線断面図である。FIG. 4 is a sectional view taken along line IV-IV in FIG.
【図５】弁リフタの変形例を示す断面図である。FIG. 5 is a sectional view showing a modification of the valve lifter.
２ 吸気弁 ７ 弁ばね ８ リテーナ ８ａ 弁コッタ ９ 弁リフタ ９ａ 筒部 ９ｂ 頂部 １１ 吸気カム軸 １１ａ カム体 Reference Signs List 2 intake valve 7 valve spring 8 retainer 8a valve cotter 9 valve lifter 9a cylinder 9b top 11 intake camshaft 11a cam body
Claims (1)
弁を備え、これらの弁を燃焼室の中心を通りカム軸に平
行な中心線の一側と他側に振り分け、中間の吸気弁を、
両側の吸気弁よりも前記中心線に対してシリンダ外側に
位置させる一方、中間の吸気弁のシリンダ軸線に対する
傾きを両側の吸気弁のそれよりも小さく、かつカム軸方
向に見て中間の吸気弁と両側の吸気弁の延長線を燃焼室
の上方で交差させ、各吸気弁の上端を弁リフタの底面に
対向させるとともに、共通の吸気カム軸の外周に、吸気
弁用の弁リフタの冠面に接触する３つのカム体を形成し
た４行程エンジンにおいて、両側の吸気弁用の弁リフタ
の軸心を、それぞれに対応するカム体の中心線に対して
中間の吸気弁用弁リフタから離れる方向に偏位させたこ
とを特徴とする４行程エンジンの動弁装置。1. A cylinder having three intake valves and a plurality of exhaust valves per cylinder, these valves being distributed to one side and the other side of a center line passing through the center of a combustion chamber and parallel to a camshaft. The valve,
The intake valve is located outside the center line with respect to the center line with respect to the intake valves on both sides, while the inclination of the intermediate intake valve with respect to the cylinder axis is smaller than that of the intake valves on both sides, and the intermediate intake valve is viewed in the cam axis direction. The extension lines of the intake valves on both sides intersect above the combustion chamber, the upper end of each intake valve faces the bottom surface of the valve lifter, and the crown of the valve lifter for the intake valve is placed on the outer periphery of the common intake camshaft. In the four-stroke engine in which three cams are formed in contact with each other, the axes of the valve lifters for the intake valves on both sides are moved away from the intermediate valve lifters for the intake valves with respect to the center lines of the corresponding cams. A valve train for a four-stroke engine, characterized in that it is deflected to
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3303893A JP2599324B2 (en) | 1991-10-24 | 1991-10-24 | Valve train for 4-stroke engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3303893A JP2599324B2 (en) | 1991-10-24 | 1991-10-24 | Valve train for 4-stroke engine |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3297801A Division JP2549957B2 (en) | 1991-10-18 | 1991-10-18 | Valve train for 4-stroke engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05256112A JPH05256112A (en) | 1993-10-05 |
| JP2599324B2 true JP2599324B2 (en) | 1997-04-09 |
Family
ID=17926535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3303893A Expired - Lifetime JP2599324B2 (en) | 1991-10-24 | 1991-10-24 | Valve train for 4-stroke engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2599324B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56162216A (en) * | 1980-05-20 | 1981-12-14 | Toyota Motor Corp | Cam type valve moving device located immediately above valve for engine |
| JPS57176311A (en) * | 1981-04-22 | 1982-10-29 | Yamaha Motor Co Ltd | Four-cycle engine |
-
1991
- 1991-10-24 JP JP3303893A patent/JP2599324B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05256112A (en) | 1993-10-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7588003B2 (en) | Valve train for internal combustion engine | |
| US4969426A (en) | Valve operating mechanism for internal combustion engine | |
| JP2750415B2 (en) | Valve train for multi-valve engine | |
| JP2599324B2 (en) | Valve train for 4-stroke engine | |
| GB2193997A (en) | Four-stroke engine valve gear | |
| JP2632888B2 (en) | Valve train for multi-valve engine | |
| JP3344236B2 (en) | Valve drive for internal combustion engine | |
| JPH0338403B2 (en) | ||
| JP2549957B2 (en) | Valve train for 4-stroke engine | |
| US6098580A (en) | Variable valve actuator apparatus | |
| JPH0355770Y2 (en) | ||
| JP2592964B2 (en) | Engine valve gear | |
| JPS6118007B2 (en) | ||
| JPH05202720A (en) | Valve driving device for internal combustion engine | |
| JP3324438B2 (en) | Valve characteristic control device for internal combustion engine | |
| JP2621049B2 (en) | Valve system for 4-cycle engine | |
| JP4200375B2 (en) | Variable valve operating device for internal combustion engine | |
| JP2827427B2 (en) | Valve system for 4-cycle engine | |
| JPH0452409Y2 (en) | ||
| JPH0720323Y2 (en) | Valve drive system for 4-cycle parallel 4-cylinder engine | |
| JP2000120413A (en) | Valve driving mechanism of multi-valve type dohc(double overhead camshaft) engine | |
| JPH05240008A (en) | Valve driving device for four-cycle engine | |
| JPH09170409A (en) | Suction and exhaust valve drive control device of internal combustion engine | |
| JPH09264111A (en) | Air inter/exhaust valve controller of internal combustion engine | |
| JPH108927A (en) | Intake/exhaust valve drive control device for internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |